Support for e500v[12] patch proposal

[Jérôme Lambourg]

Hello,

At AdaCore, we find very practical to be able to define triplets like e500v2-*-*
to configure in particular gcc accordingly (select the proper cpu, config files
and fpu support).

This means that it should be treated as a powerpc target with an "spe" ABI
(expected for example for the "elf" of "linux" targets, checked in gcc config as
"elf*spe*" of "linux*spe*).

So I'm proposing the following patch. Any comment is very welcome.

Thanks in advance for your feedback,

Best regards,
- Jerome

Author: Jerome Lambourg <address@hidden>
Date:   Mon Jun 13 12:52:17 2016 +0200

    * config.sub: Decodes e500v[12]-* basic machine as a powerpc alias, and
    add a "spe" suffix to the OS for e500v1|2 ABI selection
    * testsuite/config-sub.data: Add tests for e500v[12]-elf,
    e500v2-wrs-vxworks, e500v2-vxworksae and e500v2-wrs-linux.

e500v2-patch.diff
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